When properly equipped this list is well over 2k points.
My advice:
Take fateweaver instead of the LoC. He is near mandatory in most Daemon lists.
Drop the flamers. They aren't good.
Your princes should be equipped thusly: MoT, armour, flight, level 3, 2x greater gifts. 345pts. Or 1x greater 1x Exalted for 355pts. Tzeentch Princes are the most expensive unfortunately.
Your Tzeralds should be lvl3 with discs and one can carry the grim unless you'd prefer a Prince to hold it. The loci are ok, as has been mentioned FF giving units fnp is BS. I rarely use em unless you have the pts lying around.
Horror units should be 11 strong to generate 2 warp charges.
If you can squeeze it in, grab a bastion to start your FMCs behind and horrors in to minimize enemy alpha strike.
Potential other versions of the list: Ally in CSM for Belakor (guaranteed shrouding and invisibility) and possibly a heldrake. If you want to do a Tzeentch themed list then convert your own badass Tzeentch daemon to count as Belakor.